Do not display filters if user if there's no current_user

app/views/shared/projects/_dropdown.html.haml

@@ -21,6 +21,7 @@
     %li
       = link_to filter_projects_path(sort: @sort, archived: true), class: ("is-active" if params[:archived].present?) do
         Show archived projects
+    - if current_user
       %li.divider
       %li
         = link_to filter_projects_path(sort: @sort, personal: nil), class: ("is-active" unless personal) do